HT77xxC
5V PFM Asynchronous Step-up Controller
Features
• Low startup voltage: 0.85V (Typical)
•
High efficiency up to 85%
•
Ultra low no load input current
•
High output voltage accuracy: ±2.5%
•
Fixed output voltage: 1.8V, 2.2V, 2.7V, 3.0V, 3.3V,
3.7V and 5.0V
•
Ultra low shutdown current: 0.1μA (Typical)
•
Package type: 3-pin SOT89 and 5-pin SOT23
General Description
The HT77xxC series is a set of PFM step-up DC/DC
converters with high efficiency and low ripple. The
series features extremely low start-up voltage and
high output voltage accuracy. They require only
few external components to provide a fixed output
voltage of 1.8V, 2.2V, 2.7V, 3.0V, 3.3V, 3.7V and 5.0V.
CMOS technology ensures low supply current and
makes them ideal for battery-operated applications
powered from one or more cells.
The HT77xxC series consist of an oscillator, a PFM
control circuit, a gate driver, a reference voltage unit
and a high speed comparator. They employ pulse
frequency modulation (PFM) for minimum supply
current and ripple at light output loading. These
devices are available in space saving 3-pin SOT89
and 5-pin SOT23 packages. For the 5-pin SOT23
package, it also contains a chip enable function to
reduce power consumption during shutdown mode.
Applications
•
One, two and three cell alkaline and NiMH/NiCd
bettery powered portable products
•
Portable equipment/handheld devices
Typical Application Circuits
L1: 47μH~100μH
(Coil Inductor)
V
IN
C1: 47μF
(Ceramic)
D1: 1N5817
Cb: 10nF
Rb: 300Ω
OFF
HT77xxC
EXT
CE
GND
OUT
R1*
V
OUT
ZXTN25020CFH
ON
* R1=0.15Ω is recommended to improve ripple performance
C2: 22μF
(Ceramic)
Selection Table
Part No.
HT7718C
HT7722C
HT7727C
HT7730C
HT7733C
HT7737C
HT7750C
Output Voltage
1.8V
2.2V
2.7V
3.0V
3.3V
3.7V
5.0V
SOT89
SOT23-5
77xxC marking for SOT89 type
7xxC marking for SOT23-5 type
Packages
Markings
Note: ″xx″ stands for output voltages.
Rev. 1.10
1
August 01, 2018
HT77xxC
Absolute Maximum Ratings
Parameter
OUT
EXT and CE
Maximum Junction Temperature
Storage Temperature Range
Lead Temperature (Soldering 10sec)
ESD Susceptibility
Junction-to-Ambient Thermal Resistance,
θ
JA
Power Dissipation, P
D
Human Body Mode
Machine Mode
SOT89
SOT23-5
SOT89
SOT23-5
Value
-0.3 to +6.0
-0.3 to +6.0
+150
-65 to +150
+260
5000
400
200
500
0.625
0.25
Unit
V
V
˚C
˚C
˚C
V
V
˚C/W
W
Recommended Operating Ratings
Parameter
V
IN
Operating Temperature Range
Value
0.85 to 5
-40 to +85
Unit
V
˚C
Note that Absolute Maximum Ratings indicate limitations beyond which damage to the device may occur.
Recommended Operating Ratings indicate conditions for which the devices are intended to be functional, but do
not guarantee specified performance limits.
Rev. 1.10
3
August 01, 2018
HT77xxC
Electrical Characteristics
V
IN
=0.6×V
OUT
, I
OUT
=10mA and Ta=+25˚C, unless otherwise specified
Symbol
V
IN
∆V
OUT
V
ST
V
HOLD
I
IN
I
DD
I
SHDN
R
P(ON)
Parameter
Input Voltage Range
Output Voltage Accuracy
Startup Voltage (Fig.1)
Hold on Voltage (Fig.1)
No Load Input Current (Fig.1)
Non-switching Current (Fig.2)
Shutdown Current (Fig.1)
High Side On Resistance (Fig.3)
Test Condition
—
—
V
IN
: 0V → 2V, I
OUT
=1mA
V
IN
: 2V → 0V, I
OUT
=1mA
I
OUT
=0mA
V
DD
=V
OUT
+0.5V
CE=GND
V
DD
=1.7V, I
EXT
=10mA
V
DD
=3.2V, I
EXT
=10mA
V
DD
=4.85V, I
EXT
=10mA
V
DD
=1.7V, I
EXT
=-10mA
R
N(ON)
V
IH
V
IL
f
OSC
D
OSC
η
Low Side On Resistance (Fig.3)
CE High Threshold
CE Low Threshold
Oscillator Duty Cycle (Fig.2)
Efficiency
V
DD
=3.2V, I
EXT
=-10mA
V
DD
=4.85V, I
EXT
=-10mA
—
—
V
DD
=0.9×V
OUT
, measured at EXT pin
—
V
OUT
=1.8V
V
OUT
=3.3V
V
OUT
=5.0V
V
OUT
=1.8V
V
OUT
=3.3V
V
OUT
=5.0V
Min
—
-2.5
—
—
8
—
—
—
—
—
—
—
—
1.6
—
—
65
—
Typ
—
—
0.85
—
10
5
0.1
46
37
30
25
17
15
—
—
115
75
85
Max
5.5
+2.5
1
0.7
20
10
1
—
—
—
—
—
—
—
0.4
—
85
—
V
V
kHz
%
%
Ω
Ω
Unit
V
%
V
V
μA
μA
μA
Maximum Oscillator Frequency (Fig.2) V
DD
=0.9×V
OUT
, measured at EXT pin
Note: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating
Ratings indicate conditions for which the devices are intended to be functional, but do not guarantee specific
performance limits. The guaranteed specifications apply only for the test conditions listed.
I
IN
V
IN
C1: 47μF
(Ceramic)
L1: 47μ
(Coil Inductor)
D1: 1N5817
Cb: 10nF
Rb: 300Ω
HT77xxC
OUT
V
OUT
C2: 22μF
(Ceramic)
ZXTN25020CFH
EXT
CE
GND
Fig. 1
I
DD
EXT
HT77xxC
I
EXT
GND
CE
OUT
V
DD
V(EXT)
EXT
HT77xxC
GND
CE
OUT
I
DD
V
DD
Fig. 2
Fig. 3
Rev. 1.10
4
August 01, 2018
HT77xxC
Typical Performance Characteristics
V
IN
=0.6×V
OUT
, C
IN
=47µF, C
OUT
=22µF, L=47µH, Ta=25˚C, unless otherwise noted
HT7733C Efficiency vs. Output Current
HT7750C Efficiency vs. Output Current
HT7733C I
DD
vs. Ta
HT7750C I
DD
vs. Ta
HT7733C Startup/Hold-on Voltage
HT7750C Startup/Hold-on Voltage
R
P
vs. V
DD
R
N
vs. V
DD
Rev. 1.10
5
August 01, 2018
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